Investigation of the Performance of a new model of rectangular damper in the diagonal Convergent brace

Subject Areas : Analysis of Structure and Earthquake

mohsen yousefi ¹ , Yahya nassira ² , ali ghamari ³

1 - دانشجوی دکتری واحد زنجان
2 - Department of Civil Engineering, zanjan Branch, Islamic Azad University, zanjan, Iran
3 - Department of Civil Engineering, darehshahr Branch, Islamic Azad University, darehshahr, Iran

Received: 2021-01-19 Accepted : 2021-03-08 Published : 2021-05-01

Keywords: Absorbing Energy, Damper, Metal Yielding, Shear Yielding. Structural Control, Diagonal brace,

Abstract :

The use of dampers improves the seismic behavior of structures against seismic loads. Metallic yielding dampers include the most effective energy dissipating elements. In this research, a new type of ADAS dampers was introduced by placing it in the location of the diagonal element in order to prevent buckling and energy dissipation to be done by damper. In this contribution, 15 numerical samples were simulated by the ABAQUS software. In order to survey the recommended ADAS damper’s cyclic behavior. The cyclic behavior on the steel frames with one span and story was studied and sensitivity of cyclic behavior was studied based on the damper parameters such as thickness, length, geometry and dimension to thickness ratio. Examined damper thicknesses are 12, 21, 30 millimeters, examined damper length are 400, 500, 600 millimeters, the geometry under consideration is a rectangular damper and the thickness of brace was considered 12, 21 and 30 mm. The results of this study represented that this kind of damper had a suitable behavior in the frame energy dissipation and the total stiffness of the steel plates that make up ADAS dampers must be less than the brace stiffness to show acceptable frame performance. If the damper stiffness is more than the brace stiffness, it will cause the brace buckling and plastic joint formation in brace. The amounts of damper thickness and length in the case with less stiffness than the brace ones will result in the plastic joint concentration in damper and optimal performance.